Prostate specific antigen (PSA) - free


Nixon RG, Lilly JD, Liedtke RJ, Batjer JD, 1997, Arch Pathol Lab Med, 121(4), 385-91 , Variation of free and total prostate-specific antigen levels: the effect on the percent free/total prostate-specific antigen


Total Score


Parameter Score
1. Scale A
2. Study Population A
3. Samples A
4. Measurand A
5. Pre-Analytical A
6. Replicate Analysis B
7. Steady State C
8. Outlier Analysis C
9. Normality B
10. Variance Homogeneity C
12. CI A
13. No of Results C
14. Concentrations A
15. Total Score C7,8,10,13

Item Details

Parameter Score
Matrix Serum
Measurand Prostate specific antigen (PSA) - free
Unit ng / mL
Overall Analytical Principle Method Chemiluminescence
Number of Subjects 9
Number of Subjects included in BV estimation 9
Ethinicity Unknown
Age Mean / Median 60.0
Age Min 48.0
Age Max 69.0
Age SD
Number of Males 9
Number of Females 0
State of Well Being
Non-healthy (excl pregnant)
Study Duration Length 2
Study Duration Units Week
Sampling Intervals, e.g. X sample(s) per Interval Unit 2
Interval Units Day
Sampling Times Start Time:
End Time:
Number of Samples 5
Average Number of Samples Used for BV Estimation 5.0
Average Number of Replicates 1.0
Estimates of CVi 13.0
Calculated Confidence Intervals of CVi Lower: 0.41, Upper: 17.38
Estimates of CVg
Calculated Confidence Intervals of CVg Lower: , Upper:
Analytical CV 5.0
Calculated Confidence Intervals of Analytical CV Lower: 3.00, Upper: 14.37
Measurand Mean 1.17
Measurand Min 0.24
Measurand Max 2.1
Measurand SD